Input: simplify input_free_device()

Now that sysfs attributes that were marked for deletion can't access
their devices we do not need to set name, phys and uniq to NULL.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/drivers/input/input.c b/drivers/input/input.c
index 26393a6..5629e39 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -1024,14 +1024,8 @@
  */
 void input_free_device(struct input_dev *dev)
 {
-	if (dev) {
-
-		mutex_lock(&dev->mutex);
-		dev->name = dev->phys = dev->uniq = NULL;
-		mutex_unlock(&dev->mutex);
-
+	if (dev)
 		input_put_device(dev);
-	}
 }
 EXPORT_SYMBOL(input_free_device);